new module 'ftello'

[Bruno Haible]

Eric Blake wrote on 2007-04-17:
> I discovered that mingw lacks ftello, so we also need a module for
> ftell/ftello

2007-04-25  Bruno Haible  <address@hidden>

        * modules/ftello: New file.
        * m4/ftello.m4: New file.
        * m4/stdio_h.m4 (gl_STDIO_H_DEFAULTS): Set also GNULIB_FTELLO,
        HAVE_FTELLO.
        * lib/stdio_.h (ftello): New declaration.
        * modules/stdio (Makefile.am): Substitute also GNULIB_FTELLO,
        HAVE_FTELLO.

=========================== modules/ftello =================================
Description:
ftello() function: Retrieve the position of a FILE stream.

Files:
m4/ftello.m4

Depends-on:
stdio

configure.ac:
gl_FUNC_FTELLO
gl_STDIO_MODULE_INDICATOR([ftello])

Makefile.am:

Include:
<stdio.h>

License:
LGPL

Maintainer:
Bruno Haible

=========================== m4/ftello.m4 ===================================
# ftello.m4 serial 1
dnl Copyright (C) 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_FTELLO],
[
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  AC_REQUIRE([AC_PROG_CC])
  AC_CACHE_CHECK([for ftello], [gl_cv_func_ftello],
    [
      AC_TRY_LINK([#include <stdio.h>], [ftello (stdin);],
        [gl_cv_func_ftello=yes], [gl_cv_func_ftello=no])
    ])
  if test $gl_cv_func_ftello = no; then
    HAVE_FTELLO=0
  fi
])
============================================================================
*** lib/stdio_.h        25 Apr 2007 07:39:55 -0000      1.18
--- lib/stdio_.h        25 Apr 2007 07:49:40 -0000
***************
*** 220,225 ****
--- 220,238 ----
      fseeko (f, o, w))
  #endif
  
+ #if @GNULIB_FTELLO@
+ # if address@hidden@
+ /* Assume 'off_t' is the same type as 'long'.  */
+ #  define ftello ftell
+ # endif
+ #else
+ # undef ftello
+ # define ftello(f) \
+    (GL_LINK_WARNING ("ftello is unportable - " \
+                      "use gnulib module ftello for portability"), \
+     ftello (f))
+ #endif
+ 
  #if @GNULIB_FFLUSH@
  # if @REPLACE_FFLUSH@
  #  define fflush rpl_fflush
*** modules/stdio       25 Apr 2007 07:39:55 -0000      1.12
--- modules/stdio       25 Apr 2007 07:49:40 -0000
***************
*** 31,36 ****
--- 31,37 ----
              -e 's|@''GNULIB_VSPRINTF_POSIX''@|$(GNULIB_VSPRINTF_POSIX)|g' \
              -e 's|@''GNULIB_VASPRINTF''@|$(GNULIB_VASPRINTF)|g' \
              -e 's|@''GNULIB_FSEEKO''@|$(GNULIB_FSEEKO)|g' \
+             -e 's|@''GNULIB_FTELLO''@|$(GNULIB_FTELLO)|g' \
              -e 's|@''GNULIB_FFLUSH''@|$(GNULIB_FFLUSH)|g' \
              -e 's|@''REPLACE_FPRINTF''@|$(REPLACE_FPRINTF)|g' \
              -e 's|@''REPLACE_VFPRINTF''@|$(REPLACE_VFPRINTF)|g' \
***************
*** 45,50 ****
--- 46,52 ----
              -e 's|@''HAVE_VASPRINTF''@|$(HAVE_VASPRINTF)|g' \
              -e 's|@''REPLACE_VASPRINTF''@|$(REPLACE_VASPRINTF)|g' \
              -e 's|@''HAVE_FSEEKO''@|$(HAVE_FSEEKO)|g' \
+             -e 's|@''HAVE_FTELLO''@|$(HAVE_FTELLO)|g' \
              -e 's|@''REPLACE_FFLUSH''@|$(REPLACE_FFLUSH)|g' \
              -e '/definition of GL_LINK_WARNING/r $(LINK_WARNING_H)' \
              < $(srcdir)/stdio_.h; \
*** m4/stdio_h.m4       25 Apr 2007 07:39:55 -0000      1.12
--- m4/stdio_h.m4       25 Apr 2007 07:49:40 -0000
***************
*** 31,36 ****
--- 31,37 ----
    GNULIB_VSPRINTF_POSIX=0; AC_SUBST([GNULIB_VSPRINTF_POSIX])
    GNULIB_VASPRINTF=0;      AC_SUBST([GNULIB_VASPRINTF])
    GNULIB_FSEEKO=0;         AC_SUBST([GNULIB_FSEEKO])
+   GNULIB_FTELLO=0;         AC_SUBST([GNULIB_FTELLO])
    GNULIB_FFLUSH=0;         AC_SUBST([GNULIB_FFLUSH])
    dnl Assume proper GNU behavior unless another module says otherwise.
    REPLACE_FPRINTF=0;       AC_SUBST([REPLACE_FPRINTF])
***************
*** 46,50 ****
--- 47,52 ----
    HAVE_VASPRINTF=1;        AC_SUBST([HAVE_VASPRINTF])
    REPLACE_VASPRINTF=0;     AC_SUBST([REPLACE_VASPRINTF])
    HAVE_FSEEKO=1;           AC_SUBST([HAVE_FSEEKO])
+   HAVE_FTELLO=1;           AC_SUBST([HAVE_FTELLO])
    REPLACE_FFLUSH=0;        AC_SUBST([REPLACE_FFLUSH])
  ])